Fuse protective system



July 15, 1958 F. Y. GREPE FUSE PROTECTIVE SYSTEM Filed Feb. 4, 1954 4Sheets-Sheet l INVENT OR ATTORNEY July 15, 1958 IF. Y. GREPE 2,843,703

FUSE PROTECTIVE SYSTEM Filed Feb. 4, 1954 4 Sheets-Sheet 2 .BY 6 a lATTORN Y y 15, 1958 m. GREPE I 2,843,703

FUSE PROTECTIVE SYSTEM Filed Feb.. 4, 1954 4 Sheets-Sheet 3 INVENT ORJuly 15, 1958 F. Y. GREPE 2,843,703

FUSE PROTECTIVE SYSTEM Filed Feb. 4, 1954 I 4 Sheets-Sheet 4 I NEE-1%amedzmicfl 3. 944 90,

I ATTORNEY United States Patent FUSE PROTECTIVE SYSTEM Frederick YorkeGrepe, Toronto, Ontario, Canada, as-

signor to The Clark Controller Company, Cleveland, Ohio, a corporationof Ohio Application February 4, 1954, Serial No. 408,086

12 Claims. (Cl. 200-414) My invention relates broadly to protectivesystems for heavy-duty electrical circuits and more particularly to acombined manual and automatic protective fuse system for electricalcircuits.

One of the objects of my invention is to provide a construction ofmanual and automatic protective fuse system for electrical circuits ofheavy-duty characteristic such as 500,000 kilovolt amperes whereby apower circuit is automatically disconnected from the fuse terminals uponthe blowing of the fuse with provision for also manually disconnectingthe power circuits from the fuse terminals.

Another object of my invention is to provide a composite automatic andmanually operated disconnect system for electric fuses in heavy-dutypower circuits which permits withdrawal of a blown fuse for replacementor which effects opening of the power circuit to allow repairs of thecircuits normally protected by the fuse to be safely conducted.

Still another object of my invention is to provide a fuse systememploying a pair of aligned jaw-like receptacles in one of which acartridge type fuse may be pivotally installed for orientation into orout of position establishing connection or disconnection with the otherof the jaw-like receptacles with means associated with the cartridgefuse and the last-mentioned jaw-like receptacle for effecting either anautomatic or manual disconnect operation for isolating the powercircuits from the fuse.

Still another object of my invention is to provide an arrangement ofattachment means which may be readily applied to opposite terminals of acartridge type fuse for co-action with special fuse-receivingreceptacles about one of which receptacles the fuse may be oriented forengagement with the other of the receptacles preparatory to either anautomatic disconnect operation or a manual disconnect operation wherebythe associated power circuits are isolated from the fuse-receivingreceptacles.

Still another object of my invention is to provide a construction offittings for the terminal ends of a cartridge type fuse and for thefuse-receiving receptacles whereby manual installation and removal ofthe fuse in the fuse-receiving receptacles is facilitated whilepermitting the automatic tripping of the power circuits to thefuse-receiving receptacles under conditions of blowing of a fuse.

A still further object of my invention is to provide a cartridge typefuse disconnect or switching device which upon blowing of the fusedevelops a mechanical force which in turn operates a linkage arranged tooperate a snap-action relay which trips out an associated circuitbreaker or contactor for isolating the fuse terminals with respect tothe power circuits.

Still another object of my invention is to provide a construction ofcartridge type fuse mounting which includes snap-action mechanismassociated with the terminal ends of the fuse serving to interlock thefuse with a switch or contactor and insuring the opening of the powercircuits associated with the fuse before disconnection of the fuse fromthe power circuits.

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Other and further objects of my invention reside in the construction ofmechanism for pivotally mounting a cartridge type fuse in a fusereceptacle in association with automatic disconnect means for isolatingthe fuse from power circuits as set forth more fully in thespecification hereinafter following, by reference to the accompanyingdrawings, in which:

Figure 1 is a side elevational view schematically illustrating a fuseinstallation in accordance with my invention, the fuse being shown in aposition for normal operation in the protection of a polyphase powercircuit;

Fig. 2 is a view similar to Fig. 1 but illustrating on a reduced scalethe automatic disconnect operation of the fuse system under the actionof the blowing of a fuse by one of the methods of my invention;

Fig. 3 is a perspective view showing a fuse in position in accordancewith my invention preparatory to either an automatic or a manualdisconnect operation;

Fig. 4 is a fragmentary side elevational view of the upper receptaclewhich receives the upper end of the cartridge type fuse and showingparticularly the arrangement of the tripping mechanism which is eitherautomatically or manually tripped for effecting a disconnect operationand isolating the fuse from the associated power circuits;

Fig. 5 is a view similar to Fig. 4 showing the manner in which themanual disconnect operation isolates the fuse from the power circuits bytripping the power circuits to open position before removal of the fusefrom the fuse receptacles;

Fig. 6 is a view illustrating the next successive operation followingthe power circuit tripping operation of Fig. 5 and illustrating the fusein the process of being removed from the fuse receptacle;

Fig. 7 is a perspective view illustrating the manner of manuallyremoving or installing a cartridge type fuse in the associatedreceptacles in accordance with my invention;

Fig. 8 is a view similar to the view illustrated in Fig. 7, butillustrating the cartridge type fuse pivotally mounted in the lowerreceptacle preparatory to orientation into engaged position in the upperreceptacle;

Fig. 9 is a fragmentary front elevational view of the upper end of thecartridge type fuse mounted in the associated receptacle;

Fig. 10 is a perspective view of the components of the latch andinterlock mechanism employed in the structure of my invention;

Fig. 11 is a perspective view of the components of the actuatingmechanism;

Fig. 12 is a perspective view of the mounting plate attached to theupper end of the cartridge type fuse;

Fig. 13 is a perspective view of the bottom plate and yoke attached tothe lower end of the cartridge type fuse; and

Fig. 14 is a view showing the components of the pivot mounting assemblyfor detachably supporting the lower end of the cartridge type fuse.

My invention is directed to a construction of protec tive fuse andmounting means therefor, including tripping mechanism which isautomatically operated when the fuse blows for isolating the circuitterminals at the fuse receptacle from the associated power circuitswhich will enable the fuse to be removed and replaced or repairs andadjustments to be made on the fuse receptacle with complete safety. Iprovide fittings attachable to the opposite terminals of a cartridgetype fuse for co-action with receptacles for mounting the oppositeterminals of the fuse. In one receptacle I mount a transverse pivot barwhich supports a rockable member over which a downwardly directed forkon the bottom fitting that attaches to the terminal of the carridge fusemay be engaged and angularly shifed to a position for engaging theopposite end of the cartridge fuse in the opposite aligned recep tacle.The upper end of the fuse is provided with a composite fitting,including means enabling the cartridge to be manually engaged fororientation into and out ofposition in the aligned receptacle. The endof the cartridge may also include a variety of means for operating anejection plunger upon blowing of the fuse such as by an explosive devicethat operates upon the blowing of the fuse for bulging or displacingsome part of the cartridge. Such displacement operates an actuator thattrips a latch resulting in the automatic tripping of the circuitcontrolling mechanism and the opening of the power circuit to the fusereceptacles. With the power circuits thus isolated from the fusereceptacles the fuse may be withdrawn and replaced or repaired andadjustments made on the operating and tripping mechanism.

In a polyphase system the blowing of any one fuse automatically tripsopen the switch or contactor, clears all phases simultaneously and, whatis most important, prevents single phasing. The problem of singlephasing has always been a bugbear in the use of fuses. The device may bemanually operated by pushing or pulling on an associated rod or byrotating an associated crank shaft. The preferred way is by pushing orpulling on the rod engaged in a ring in the upper attachment fitting onthe fuse.

In the application of my invention where an explosive displaceablestriker pin is associated with the fuse, when the fuse blows, thestriker pin is ejected and is held ejected by a spring locking ringwithin the body of the fuse. The fuse must be dismantled to get at thisring so that it is, therefore, inaccessible to the operator and cannotbe pushed back down.

Referring to. the drawings in more detail, reference character lldesignates a rack or panel on which there is mounted the pedestalinsulator 2 projecting forwardly from the rack and forming a mountingmeans for the top receptacle 3 for the upper terminal of a cartridgefuse 4. The fuse receptacle 3 is a multiple spring jaw assembly which issecured by a suitable retaining bolt 5 to the top plate 6 carried by thecorona shield 7 secured to the end of the pedestal insulator 2. Theplate 6 has an extension 6a at the upper end thereof provided with anaperture 6-17 therein which facilitates installation of the assembly.The rod 8 formed from insulation material is provided with spacedflanges 9 of insulation material distributed along the length thereoffor insuring complete insulation of the tripping mechanism with respectto the power circuit control contacts shown at 1% housed within casing11 supported by bracket 12 from the rear of rack 31. The power circuitcontrol contacts comprise stationary contacts 14- and movable contacts15 controlled by movement of pivotally mounted spring biased lever 16pivoted at 17. The positions of contacts 14 and 15 which control apolyphase power circuit leading to the cartridge type fuse 4- arecontrolled by the coaction of the tension spring 59 and the compressionof spring 59a. The tripping mechanism represented at if, is shown innormal position in Fig. 1 with the contacts closed and in Fig. 2 withthe contacts open.

In the lower right-hand portion of Fig. l, I have illustrated the mannerin which the protective system of this invention is associated with apolyphase circuit represented at 7%. In this arrangement the circuitsleading to the fuses represented at 71, 72 and 73 include contactorswhich are maintained closed so long as operating solenoid 74 isenergized. However, when operating solenoid 74 is de-energized, thecircuits through the contactors '75, 76 and 77 are opened under theaction of spring 78 which pulls actuating member 79 to open the circuitsthrough the fuses. The protective system of my invention is applicableto many arrangements of the polyphase circuits illustrated herein, byway of example.

The tripping mechanism is journaled between a pair of plate membersshown at 19 and 2t) projecting from the front of plate 6 and formingmounting means for the transverse pin 21. The transverse pin 21 formsjournaling means for the transversely extending member 22 from whichlugs 22a and 22-h project for journaling transverse pin 21. Thetransversely extending member 22 serves as a mounting for the strip 23which carries the upwardly extending member 24 which is pivotallyconnected at 25 to the rod of insulation material 8. Thus angularrocking movement of member 22 imparts corresponding movement to arm 24for moving rod 3 in a linear direction for controlling the powercontacts 14 and 15. The member 22 is provided with a forwardlyprojecting tripping lever 26 which extends to a position slightly beyondthe axis of the cartridge type fuse 4 when the fuse is mounted inreceptacle 3. The tripping lever 26 has an adjustable abutment stop inthe end thereof formed by a screw 27 having a lock nut 27-a thereonwhich permits the abutment stop constituted by the head 27-11 of screw27 to be advanced to a position at which the striker pin 28, or otherdisplaceable member, can engage the head 27-17.

The transverse pin 21 also provides journaling means for the latchelement 29 for co-action with the lock element shown at 62, pivoted onpin 63 that extends between and outwardly projecting bracket constitutedby plate members 19 and 20. The lock element 62 is spring biased by coilspring 64 that is centered by pin 63 and fits over plate member 19 atone end and engages the lock element 62 at the other end. The lockelement has two oppositely extending arms, disposed at approximately 90to each other, one of which terminates in a cam-shaped end 62a and theother of which terminates in a locking head 62b. The cam-shaped end 62-acoacts with the latch head 30 of the terminal end 31 of the cartridgefuse while the locking head 62b coacts with the projecting end 29a oflatch element 29.

The cartridge fuse 4 is equipped on the end of the terminal cap 31thereof with an attachable head formed by the centrally apertured plate36 secured in position on the terminal end of the cartridge fuse by capscrews 39. The plate 36 is provided with a pair of spaced lugs 4!between which the lock lever 41 is pivoted as represented at 42. Thelock lever 41 is provided with a transversely extending arm 41-atransversely apertured at 41b for the passage of the ejector pin 28. Theplate 36 carries the latch head 30 engageab le'by latch 29 ashereinbefore explained. The position of lock lever 41 is angularlyadjustable by means of a set screw 41c which engages one side of theterminal cap 31 of the cartridge fuse 4, thereby predetermining theangular elevation of the arm 41-a above the end plate 36. The lock lever41 is provided with a ring portion 41d through which the prong of themanual rod 32 may be inserted, as illustrated in Fig. 8, in withdrawingor replacing a fuse in the fuse receptacles. The cartridge fuse 4 islifted out of engagement with the receptacles or inserted into thereceptacles by use of manual rod 32 in the arrangement represented inFig. 7 where forked end'34 engages beneath the lock lever 41 asillustrated in Fig. 7. V

In order to provide for the orientation of the cartridge fuse 4 aboutthe lower receptacle, I provide an attachment on the lower end ofthefuse cap 43 of the cartridge fuse 4 in the form of a plate 44 fromwhich fork 45 lineally projects. The fork 45 has a bifurcation whichextends over the rockable member 46 journaled on pin 47 in spaced lugs48 which project from the plate 49 secured by bolts 50 to a coronashield 51 on the end of pedestal insulator 52 supported on the rack 1 ina position 7, inserting the fork 45 over the pivoted plate 46 which isgravitationally suspended-in an angular position as represented in Fig.7, preparatory for receiving the fork-ed end 45 of the fuse cartridge.The rockable member 46 normally remains in the angularly disposedposition illustrated in Fig. 7 by abutment with suitable stops locatedbetween the inner faces of lugs 48 under the action of biasing springid-41 one end of which is engaged in one end of the lugs 48 and theother end of which is engaged in the slot 4645 in rockable member 46,enabling the manual rod 32 to be withdrawn from the position illustratedin Fig. 7, and axially shifted to the position in which prong 35' isinserted through ring 41-51 as represented in Fig. 8, whereupon thecartridge fuse 4 is oriented about transverse pivot pin 47 as a centerto a position in which terminal cap 31 is engaged between spring jaws 3and latching head 30 is engaged beneath latch 29.

The lock lever 41 operates to raise latch 29 and correspondingly elevatetrip lever 26 when the fuse t is manually removed by use of manual rod32 resulting inthe shifting of interlock rod 8 through rack 1 and themovement of contact lever 16 for opening contacts 14 "and 15', therebyopening the power circuit to the fuse before the fuse is removed fromthe receptacles 3 and 53 and this enables the fuse to be removed withperfect safety. For this purpose adjustment may be initially made bymovement of set screw 41c to provide for necessary displacement of thelock lever 41. That is to say, when the prong 35 of hook stick 32 isinserted in the ring 41-0! of lock lever 41 and an outward pulleffected, the lock lever 41 pivots about transverse pin 42 and liftslatch 27. Locking element 62 restrains latch 29 until the actuatingelement constituted by lock lever 41 is manuallydisplaced or the triplever 26 operated by some device comparable to striker pin 28. In thelatter instance, the latch 29 lifts the trip lever 26 actuating theinterlock rod 8 through member 24. Movement of the interlock rod 8 opensthe contacts 14 and 15 of the snap-action relay in the rear of the rack1 opening the power circuits and permitting withdrawal of the fuse. Thisinsures that the fuse cannot be withdrawn under load conditions. Whenthe fuse has been withdrawn, latch 29 is then mechanically locked openby locking element 62 and cannot be tripped until a replacement fuse isinserted and locked in operating position.

The striker pin 28 in the end of the cartridge fuse 4 is illustratedsimply as one of the methods of operating the protective system. Whenthe fuse 4 isblown, according to one of the methods of my invention, thespark discharged therefrom may ignite an ignition fuse communieating aflame to an explosive charge which explodes. The force of the explosionconfined within the cartridge serves to axially eject the striker pin 28which passes through aperture 4147 in lock lever 41 and engages theabutment stop formed by screw head 2742, thereby angularly shifting triplever 26 and moving interlock rod 8 from the position shown in Fig. 1 tothe position shown in Fig. 2, thus opening the circuit through contacts14 and 15. The power circuits to the fuse receptacles 3 and 53 are nowisolated so that removal and replacement of the blown fuse can beproceeded with safely.

The snap-action relay includes coil springs 59 and 59-a which controlthe position of lever 16. The tension of spring 59 holds the rod 8toward the left and 'holds actuating arm 26 down, and this holds latch29 down in latching position. A space at 8i) provides for such movementof lever 16 that spring a can expand and hold contacts i5 closed. Whenarm 26 is forcibly raised by raising hook 29 and forcibly moving rod 8toward he right against tension of spring 59, the space 89 is closed andthe collar or nut 81 strikes the end of the switch arm and opens thecontacts against the pressure of spring 59-a. The latch 62 keeps the rod8 held toward the right in spite of the extension of spring 59. When thefuse is blown or removed and rod 8 displaced to the position shown inFig. 2, coil spring 59 contracts and coil spring SSLa expands as member60 is displaced toward the right looking at Figs. 1 and 2, therebymoving contacts 15 away from fixed contacts 14 and opening the powercircuit through contacts 14 and 15 to the fuse receptacles.

In the operation of the. protective system, the handle element or locklever 41 is biased to a first position and is movable to a secondposition. The latch element 29 is movably supported on a frame and isbiased to normally latch the fuse end in its receptacle and is movableto unlatching position. The lock element 62 is movably supported on theframe and biased toward a locking position and is normally held inunlocking position by engagement with the fuse and when in itsreceptacle. The actuating element 26 is movably supported on the frameand is biased to a normal position and movable to an actuating positionand back to normal position and is adapted to acuate a circuitcontrolling device by said movements. The said elements are arranged tooperate as follows: manual movement of the handle element or lock lever41 from a first position to a second position moves the actuatingelement 26 to actuating position and then moves the latch element 2? tounlatching position, and continued movement of the handle element locklever 41 withdraws the fuse end out of the receptacle 3 and itswithdrawal movement permits the lock element 62 to move to lock thelatch element 29 in unlatched position and the actuating element 26 inactuating. position. Upon manual movement of the handle element or locklever 41 of the same fuse or of a like fuse in the other direction, thehandle element is returned to itsfirst position and the fuse end isreturned into the receptacle, the end of the fuse restoringthe lockelement 62 and thereby unlocking the latch element 29 and actuatingelement 26, the latch element returning to latching position whereuponthe actuating element returns to its normal position.

I have found the construction described herein highly practical inmanufacture and production and efiicient in use, but I realize thatmodifications may be made, and I desire that it be understood that nolimitations upon my invention are intended'other than may be imposed bythe scope of the appended claims.

What I claim and desire to secure by Letters Patent of the United Statesis:

1. In a fuse disconnect mounting and mechanism for supporting a fuse ofthe cartridge type, comprising supporting means, a pair of laterallyopen receptacles for the-ends of a cartridge fuse, mounted in saidreceptacles, a movable actuating element for actuating an apparatusassociated with the fuse and biased to a normal position, a movablelatch element disposed normally in a latching position and latching anend of the cartridge fuse in its associated receptacle, a manuallycontrollable member supported on said end of the cartridge fuse andmovable manually to move the actuating element to an actuating positionsubject to restoration to an unactuating position, lock means to lockthe actuating element in actuating position before the cartridge fuseend is withdrawn, the mechanism being operable by movement of the saidend of said fuse into the associated receptacle to successively set thelatch element and unlock the actuating element for return to its normalposition.

2. A fuse disconnect mounting and mechanism for supporting a fuse of thecartridge type that forcibly ejects a fuse projectable element outwardlywhen the fuse blows, comprising supporting means, a pair of laterallyopen receptacles for the ends of the fuse mounted with respect to saidsupporting means, a movable actuating element for actuating an apparatusassociatedwith the fuse and biased to a normal position, a movable latchelement journaled with respect to said supporting means and disposednormally in a latching position, and latching an end of the cartridgefuse in its associated receptacle, manually controllable means supportedon an end of the cartridge fuse and movable to displace the actuatingelement to an actuating position subject to return to its normalposition and withdraw the cartridge fuse end from the receptacle, andlock means to lock the actuating element in actuating position beforethe cartridge fuse end is withdrawn, said mechanism being operable bymovement of the cartridge fuse end into the receptacle to successivelyset the latch element and unlock the actuating element for return to itsnormal position, said actuating element being disposed in the path ofmovement of the fuse projecting element and movable thereby to actuatingposition.

3. A fuse disconnect mounting and mechanism for supporting a fuse of thecartridge type, comprising a support, a pair of laterally openreceptacles for the ends of a cartridge fuse mounted with respect tosaid support, a movable actuating element for actuating a circuitbreaker associated with said fuse and biased to a normal position, amechanism comprising a movable latch element pivotally mounted withrespect to said support and normally maintained in a latching positionfor latching an end of the cartridge fuse in its associated receptacle,a manually controllable element supported on the end of the cartridgefuse and movable to move the latch element to cause it to engage theactuating element subject to an unlatching operation and withdrawal ofthe fuse from its receptacle, and spring biased lock means journaled onsaid support adjacent one of said receptacles to lock the latch elementin unlatched position to cause it to retain the engaged actuatingelement in actuated position, said mechanism being operable by movementof the cartridge fuse end with re spect to the receptacle to release thesaid lock means and to successively set the latch element to latch thefuse in the receptacle and release the actuating element for return toits normal position.

4. A fuse disconnect mounting and mechanism for supporting a fuse of thecartridge type that forcibly ejects a fuse projectable element outwardlywhen the fuse blows, comprising supporting means, a pair of laterallyopen receptacles for the ends of the fuse cartridge mounted on saidsupporting means, a movable actuating element for actuating an apparatusassociated with the fuse and journaled with respect to said supportingmeans and biased to a normal position and movable to an actuatingposition, a movable latch element pivoted on said support and disposednormally in a latching position and latching an end of the cartridgefuse in its associated receptacle, a member pivotally supported on oneend of the fuse and movable manually to move the latch element to causeit to unlatch said fuse end for permitting withdrawal of the fusecartridge from its associated receptacle and to move the actuatingelement to an actuating position, and lock means to lock the latchelement in unlatched position and to retain the actuating element inactuated position, said mechanism being operable by movement of the endof the cartridge fuse with respect to the associated receptacle torelease the said lock means and to successively set the latch element tolatch the fuse end and release the actuating element for return to itsnormal position, said actuating element being disposed in the path ofthe fuse projectable element and movable thereby to actuating position.

5. A fuse disconnect mounting and mechanism for supporting a fuse of thecartridge type that forcibly ejects a projectable element outwardly andretains it in outer position when the fuse blows, comprising a pair ofinsulated supports, a laterally open receptacle mounted on each of saidsupports for supporting the ends of the fuse, a bracket carried by oneof said supports adjacent the receptacle thereon, a movable actuatingelement for actuating an apparatus associated with the fuse andjournaled in said bracket and biased to a normal position and disposedin the path of movement of the projectable element and movable to andretained in an actuating position by movement of the projectableelement, a movable latch element disposed normally in latching positionfor latching an end of the cartridge fuse in said last mentionedreceptacle, a manually controllable element supported on the end of thefuse cartridge and movable within limits to either of two positions andin one of which it moves the latch element to unlatching position andenables the fuse cartridge to be withdrawn from the receptacle, and theother of which enables the end of the fuse cartridge to be maintained inthe said receptacle, lock means operable by said other movement of themanually controllable element to lock the actuating element in actuatingposition independently of the projectable element on the fuse cartridgewhen the fuse cartridge is withdrawn from the receptacles, and the latchelement being operable by movement of the end of a replacement fuse intothe receptacle to restore it to latching position and to correspondinglyrestore the lock means to permit the actuating element to return tonormal position.

6. A fuse disconnect mounting and mechanism for supporting a fuse of thecartridge type that forcibly projects an element outwardly and retainsit in outer position when the fuse blows, comprising a pair of spacedinsulated aligned supports, a laterally open receptacle carried by eachof said supports for supporting the ends of the fuse, a movableactuating element for actuating a circuit breaker associated with saidfuse and biased to a normal position and disposed in the path ofmovement of the projectable element of said fuse and movable to andretained in an actuating position by movement of the projectableelement, mechanism mounted on one of said supports and comprising amovable latch element disposed normally in latching position andoperative for latching an end of the cartridge fuse in its receptacle,mechanism supported on the end of the cartridge fuse and movablemanually to either of two limited positions in one of which said latchelement is engaged to cause it to move the actuating element in adirection to retain it in actuated position, and in the other of whichsaid latch element is displaced to unlatching position, and lock meansrendered effective by said movement of the latch element to lock it inposition to cause it to retain the actuating element in actuatedposition independently of the fuse projectable element when the blownfuse is withdrawn from said receptacles, and the mechanism beingoperable by movement of the end of a re placement fuse into thereceptacle to restore the lock means and restore the latch element tolatching position and permit the actuating element to return to normalposition.

7. A fuse disconnect mounting for a cartridge type fuse comprising apair of laterally open receptacles for the conductive ends of acartridge type fuse, an actuating element for actuating an apparatusassociated with said fuse and biased to a normal position anddisplaceable to an actuating position and operative to operate saidapparatus upon displacement from one position to the other, theactuating element being supported adjacent the end of one of saidreceptacles, a mechanism at said end of said receptacle comprising abiased latch element normally latching the end of the fuse in saidreceptacle against withdrawal, and a handle element supported on the endof the fuse end and manually movable to unlatch the latch element topermit the fuse end to be withdrawn and to cause the latch element tomove the actuating element to actuating position before the latchelement is fully unlatched, said handle element being operative towithdraw the fuse end from said receptacles upon continued normalmovement of the handle element, a biased lock element freed to move bywithdrawal movement of the fuse end for thereupon locking the latchelement in unlatched position and the actuating element in actuatingposition,"the latch element being restored by movement of a replacementfuse end into the receptacle by the handle elementto restore'thelatchelement to latching position and thereby correspondingly restoring'the'actuating elementto normal position.

8. A fuse disconnect mounting'and mechanism for supporting a fuse of thecartridge type having a pin ejectable upon the blowing of the fuse,comprising a support, a pair of receptacles mounted with respect to thesup ort forthe-insertion and removal of the cartridge type fuse, saidfuse having a-latching head on one end thereof and provided with apivotally mounted manually controllable member for manipulating saidfuse with respect to said receptacles, said member being angularlydisplaceable in a plane extending diametrically through the end of saidfuse and through the latching head thereon, a latch pivotally mountedwith respect to said support in a position above one of said receptaclesfor engaging the latching head on the end of said cartridge when saidcartridge is inserted in said receptacle, a device for actuating acircuit breaker associated with said fuse and controlled by said latch,said member extending beneath said latch and operative to raise saidlatch when said member is angularly displaced for controlling saiddevice, said member being centrally apertured for the passage of theejectable pin of said fuse whereby said device is controlled by theejected pin independently of the displacement of said latch.

9. A fuse disconnect mounting and mechanism for supporting a fuse of thecartridge type having a pin ejectable upon the blowing of a fusecomprising a support, a pair of receptacles mounted with respect to thesupport for the insertion and removal of the cartridge type fuse, saidfuse having a latching head on one end thereof and provided with apivotally mounted manually controllable member for manipulating saidfuse with respect to said receptacles, said member being angularlydisplaceable in a plane extending diametrically through the end of saidfuse and through the latching head thereon, a latch pivotally mountedwith respect to said support in a position above one of said receptaclesfor en-' gaging the latching head on the end of said cartridge when saidcartridge is inserted in said receptacle, a device for actuating acircuit breaker associated with said fuse and movable by said latch,said member extending beneath said latch and operative to release saidlatch when said member is angularly displaced for moving said device,said member being centrally apertured for the passage of the ejectablepin of said fuse whereby said device is also moved by the ejected pinindependently of the displacement of said latch, in which a springbiased locking member pivotally mounted with respect to said support andmovable to retain said device in the position to which it is movedeither by said pin or by the displacement of said member upon removal ofthe fuse from the associated receptacle and pending restoration of theposition of said locking member by abutment of the cartridge fusetherewith upon replacement of a fuse in the associated receptacle.

10. A terminal structure for the end of a cartridge fuse comprising aplate attachable to the end of a cartridge fuse, a latching head carriedby one side of said plate adjacent the peripheral edge thereof, a pairof lugs carried by the same side of said plate adjacent the oppositeperipheral edge thereof in diametrical alignment with said latchinghead, a lock lever pivotally mounted in said lugs and extendingdiametrically of said plate and around the end of the cartridge fuse,one end of said lever terminating short of said latching head and theother end of said lever having an adjustment screw therein forestablishing an adjustable abutment with the side of the end of thecartridge fuse and controlling the amplitude of displacement of saidlock lever around said lugs as a pivot, the diametrically extendingportion of said lock lever being apertured at the center of the end ofthe cartridge fuse'for the passage therethrough of a projecta'ble; pinassociated with said fuse and means g-carried bysaid lock lever forengagement by' an inser- 1 tion and removal tool.

11.- A' fuse disconnect mounting for a cartridge type fuse comprising apair of laterally open receptacles for the conductive ends of acartridge type fuse, a-circuit ing position-and operative to operate thecircuit'breaker upon'displacement to the actuating position; theactuating element being supported-adjacent'the end-of one of saidreceptacles, a mechanism at said end of said receptacle comprising abiased latch element normally latching the end of the fuse in saidreceptacle against withdrawal, and a handle element supported on the endof the fuse end and manually movable to unlatch the latch element topermit the fuse and to be withdrawn and to cause the latch element tomove the actuating element to actuating position before the latchelement is fully unlatched, said handle element being operative towithdraw the fuse end from said receptacles upon continued normalmovement of the handle element, a biased lock element freed to move bywithdrawal movement of the fuse end for thereupon locking the latchelement in unlatched position and the actuating element in actuatingposition, the latch element being restored by movement of a replacementfuse end into the receptacle by the handle element to restore the latchelement to latching position and thereby correspondingly restoring theactuating element to normal position.

12. A fuse disconnect mounting for a cartridge type fuse, having acircuit breaker in a circuit with a fuse, the mounting comprising a pairof laterally open receptacles for the ends of a cartridge type fuse, afuse manipulating member on one end of the fuse cartridge comprising ahandle element movably supported on the said end of the fuse cartridgeand movable to either a first or second position, a frame support, alatch element movably mounted on said frame support adjacent one of saidreceptacles and biased to normally latch one end of said fuse in saidlast mentioned receptacle and movable to unlatching position, a lockelement movably mounted on the frame support and biased toward a lockingposition and normally held in unlocking position by engagement with thefuse when in its associated receptacle, an actuating element movablysupported on the frame support and biased to a normal position andmovable to an actuating position and back to normal position, and meansto cause the circuit breaker to open when moved to the actuatingposition, the said elements being arranged to operate as follows: manualmovement of the handle element from first position to second positionmoves the actuating element to actuating position and moves the latchelement to unlatching position, and continued movement of the handleelement withdraws the fuse end out of the receptacles whereby itswithdrawal movement permits the lock element to move to lock the latchelement in unlatched position and upon manual movement of the handleelement of the same fuse cartridge or of a like fuse cartridge in theother direction, the handle element is returned to its first positionand the end of the fuse cartridge is returned into the receptacle, theend of the fuse cartridge restoring the lock element thereby unlockingthe latch element and permitting it to return to latching position andthe latch element releasing the actuating element whereby said actuatingelement returns to normal position.

References Cited in the file of this patent UNITED STATES PATENTS826,888 Sachs July 24, 1906 1,192,974 Anderson Aug. 1, 1916 (Otherreferences on following page) 11 UNITED STATES PATENTS Wyman Oct. 13,Farrell June 19, Ramsey July 1, Matthews July 15, Matthews Sept. 9,Ludwig et a1. Feb. 10, Dickinson Mar. 23, Triplett June 26, Strang eta1. Sept. 25, Froland Jan. 13, Dannenberg June 14,

12 Steinmayer Apr. 10, Smith Jan. 1, Lindell June 3, Lindell Mar. 2,Schneider May 31, Smith Aug. 30, Schneider Feb. 14,

FOREIGN PATENTS Great Britain Dec. 24, France May 23,

